CN101943596A - Calibrating device and calibrating method of automobile air mass flow meter - Google Patents
Calibrating device and calibrating method of automobile air mass flow meter Download PDFInfo
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- CN101943596A CN101943596A CN2009100631154A CN200910063115A CN101943596A CN 101943596 A CN101943596 A CN 101943596A CN 2009100631154 A CN2009100631154 A CN 2009100631154A CN 200910063115 A CN200910063115 A CN 200910063115A CN 101943596 A CN101943596 A CN 101943596A
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Abstract
The invention relates to a calibrating device of an automobile air mass flow meters. The calibrating device is controlled by a computer and provided with a calibrating pipeline, a communication interface is connected with the calibrated flow meter; the voltage output pin of the calibrated flow meter is designed as a multiplex pin with functions of voltage output and data communication; and the computer reads the output voltage, and read and write data of the flowmeter through the communication interface and the lead wire via the pin. The calibrating device of the automobile air mass flowmeters is used for calibrating the flowmeters, and the computer computes the interpolation computational functional model for each flowmeter and transmits the parameters of the functional model of each flowmeter to the non-volatile storage space of the corresponding flowmeter. The calibrating device can be used for simultaneously calibrating 8 or more automobile air mass flowmeters; and for the calibration of the automobile air mass flow meters, the characteristics of the voltage output can be calibrated according to normal air mass flow, and the reference calibration can also be performed in accordance with the characteristics of the output voltage of the reference flowmeter.
Description
Technical field
The present invention relates to the calibrating installation of automobile air quality flowmeter.
Background technology
Hot type automotive air mass flow measurement utilizes heat exchange principle to measure air mass flow.Automobile is installed on the inlet channel between automobile filter and the air throttle with air flow meter, be used for measuring the air capacity that sucks in the engine, its output signal is as the major parameter of control fuel injection amount in the motor car engine fuel oil electric injection system, the basic fuel injection amount and the injection time of decision automobile.Because air flow meter is very big to vehicle performance influence, directly influence the overall performances such as dynamic property, economy, oil consumption, exhaust emissions index of motor car engine.
Up to the present, in the production of automobile air flow meter, do not see device and method of the present invention as yet.Present already present flow calibration device, or flow calibrating installation, or flow calibration equipment its essence is the difference that detects tested flowmeter output and the output of desirable flowmeter by device, but can not change this species diversity.
Present most automobile air flow meter is based on the design of hot type principle, and its sensing principle is divided into two big class, constant difference formula and heat distribution formulas.Constant difference formula air flowmeter is to exceed a stationary temperature than gas flow temperature with the resistance heated on the thermal probe, when air flows through thermal probe, with the heat of taking away on the thermal probe, flow is big more, the heat of taking away is many more, and the heat that utilizes the measurement air flow to take away is measured the flow of tested air indirectly; Heat distribution formula air flowmeter is to settle the thermometric structure respectively in the upstream and downstream of heating resistor, when air flows through thermal probe, Temperature Distribution in the thermal probe around the heater element is changed, the temperature of downstream fluid is higher than the temperature of fluid upstream, flow is big more, the temperature of downstream fluid exceeds many more than upstream temperature, utilize and measure the flow that the heater element upstream and downstream temperature difference is measured fluid indirectly.The thermal probe making apparatus small investment of constant difference formula air flowmeter, with low cost, but the consistance of thermal probe assembling and positioning can obviously influence the consistance of thermal probe output original signal, thereby later stage manufacturing technique requirent height, having a big risk of substandard products and waste product appears in the corresponding cost that improved in the production run.The consistance of the thermal probe installing and locating of heat distribution formula flowmeter is relatively easily controlled, but thermal probe production equipment costliness, thermal probe cost height.
No matter be constant difference formula flowmeter or heat distribution formula flowmeter, the present mode of production is to obtain the electric signal relevant with flow from thermal probe, it is the primitive relation of air mass flow and output voltage, use the way of hardware (operational amplifier) conditioning or computed in software then, this original voltage output characteristics is transformed into the desired voltage output characteristics of flowmeter, as shown in Figure 1.
In present automobile air flow meter production method, for the flowmeter of a certain specific model, thermal probe output voltage characteristic curve is converted to flowmeter output voltage characteristic curve, its transfer function is fixed.The problem that this production model is brought: 1. because fixing transfer function, the trickle inconsistent of structure or parameter appears in thermal probe production, or occur in the thermal probe assembling process trickle inconsistent, all may cause the variation of thermal probe output voltage characteristic curve, just must cause the variation of flowmeter voltage output characteristics curve according to fixing transfer function, the flowmeter voltage output characteristics is inconsistent in causing producing in batches, has reduced the precision and the qualification rate of product; .2 to guarantee fixing and accurate functional transformation relation, when using hardware (operational amplifier) when realizing, the highly stable and high precision of inevitable requirement build-out resistor, thereby for the manufacturer of high-quality flowmeter, a large amount of resistance needs the laser adjustment, has improved production cost.3. the automobile of different model uses the flowmeter of different model, the flowmeter of different model requires to have different output voltage relation curves, this will cause requiring in process of production to design the needs that a large amount of hardware circuits satisfies the different model flowmeter, make the production inventory cost increase.
The result of above-mentioned condition is that its economic strength is relied on by minority leading enterprise, adopt high high starting point to become the manner, accurately control each link of production run, produce high-quality flow motor sensor, long-term monopolization flow motor meter market, and medium-sized and small enterprises use thermal probe cheaply owing to forming enough batches mostly, the thermal probe resistance precision, the physical dimension precision, manufacturing process, the fine difference of assembling measure of precision etc. all can bring enough big influence to thermal probe output voltage characteristic curve, and the conversion method of fixed function, it is then powerless when thermal probe output voltage characteristic curve changes, add the inconsistent and dispersed of circuit elements device parameter, the precision of the flowmeter of producing like this and consistance can't guarantee, in case demarcate the product of finding not meet quality requirements, just can only work as substandard products or waste disposal, thereby cause under the flowmeter quality of most medium-sized and small enterprises production.
Aspect the demarcation calibration equipment, patent publication No. CN 1793799A has proposed a kind of calibration equipment of easy T type tube side formula, air generator produces air-flow, behind T type pipe, be divided into two branch roads, one the tunnel connects proving flowmeter, and another road connects by the checking flow meter, supposes that air-flow is mean allocation at two branch roads, the output voltage of contrast standard flowmeter and tested flowmeter just can draw the difference of tested flowmeter and proving flowmeter.Patent publication No. CN 200982882A thinks that the supposition air-flow is that this method of mean allocation exists error at two branch roads in the T type tubular construction, proposed another solution: supposition flow in same pipeline equates, and should be identical at the output voltage of same traffic down-off meter, propose the structure that proving flowmeter is connected with tested flowmeter, and used technology based on computer data acquiring.Patent publication No. CN101435715A thinks that also there is precision in T type tubular construction, a lot of problems such as repeatability.Even think that simultaneously cascaded structure can not guarantee precision, even in a pipeline, the difference of flowmeter installation position, because various influential factors also can produce error, also be same flowmeter is installed on pipeline under same traffic diverse location, its output voltage may be because various influence factors and difference.According to this thinking, patent publication No. CN101435715A proposes before demarcation, on proving flowmeter interface and tested flowmeter interface, all insert proving flowmeter, wherein be placed in proving flowmeter on the tested flowmeter interface and be used for measuring the error of interface position, and this error is stored in the computing machine, in formal the demarcation, be used for the compensated position error; And a plurality of tested flowmeter interfaces of design on same pipeline are further proposed, to improve the efficient of demarcating.This method can't validation criteria flowmeter itself consistance, this method supposition proving flowmeter is consistent standard, if under same traffic, the output voltage of proving flowmeter there are differences, so just think that this species diversity is the difference that factors such as pipeline location cause, there is the risk that the propagation of error of proving flowmeter is arrived calibration equipment in this thinking, may strengthen the error of demarcation on the contrary under extreme case.The common employed proving flowmeter of these patented technologies, the flowmeter that does not have metering transmission standard, but the general-utility car air flowmeter of some Premium Brands, thereby under this condition, these devices at most also can only verification hang down the automobile air flow meter of an accuracy class than the flowmeter of Premium Brands.
Above-mentioned calibration equipment all exists following common problem: 1. flow standard problem, whether a flow that recurs and have definite precision can be provided is the key of this problem, use automobile air flow meter to come the verification automobile air flow meter, as if this does not meet the rule that metering is transmitted, or is that we at first admit the flowmeter of oneself low accuracy class of flowmeter than the rival.2. said apparatus only is the verification means, whether the automobile air flow meter of producing by the checking procedure check has the voltage output characteristics identical with the high-quality automobile air flow meter, as previously mentioned, the resistance of thermal probe in the automobile air flow meter, physical dimension, series of factors such as flowmeter assembling process all will influence the voltage output characteristics of thermal probe, in large-scale production, be difficult to guarantee its consistance, disposal route according to the fixed conversion function, output voltage feature inconsistent that must cause flowmeter, this problem do not solve all the time.Particularly when the relatively poor thermal probe of using character, this problem is more serious.
Present already present flow calibration device, or flow calibrating installation, or flow calibration equipment its essence is the difference that detects tested flowmeter output and the output of desirable flowmeter by device, but can not change this species diversity.
Summary of the invention
The calibrating installation and the calibration steps that the purpose of this invention is to provide a kind of automobile air quality flowmeter, carry out communication by computing machine and each flowmeter, according to the original flow of actual measurement thermal probe and the relation of output voltage, by accurately changing the mode of transfer function in process of production, eliminate the individual difference of probe, produce the automobile air flow meter of final products height unanimity.In other words, even the relation of the original flow of thermal probe and output voltage is inconsistent, by method of the present invention, also can produce highly consistent final products, thereby greatly reduce in the production run to the technological requirement of probe with to the harsh requirement of whole production technology, reduce cost significantly.Solved the problem that aforementioned high-end enterprise exists simultaneously in the process of producing automobile air flow meter.。
The calibrating installation of described automobile air quality flowmeter, this device is by computer control, be provided with the calibration pipeline, the calibration pipeline is provided with the calibrated flowmeter jack, corresponding calibrated flowmeter is installed on the calibrated flowmeter jack, this device is provided with communication interface, communication interface is connected with calibrated flowmeter, it is characterized in that: the voltage output pin of calibrated flowmeter is configured to the multiplexing pins of voltage output and data communication, and computing machine reads the data of the output voltage and the read-write flowmeter of flowmeter via this root pin by communication interface and lead-in wire.
Finished the flowmeter of hardware production and encapsulation, how by the flowmeter standard interface that has become standard in industry the calibration calculations function in the flowmeter to be revised one by one targetedly is the key that the present invention will solve, actual voltage signal output pin and flowmeter and the extraneous data communication pin that carries out the reading and writing data exchange of being multiplexed into of the voltage signal pin of standard interface on the flowmeter, this kind special flow is in respect of unified profile and inner structure, comprise on all four circuit and component parameter, this flow meter specially has special description in another patent application document " not increasing the intelligent automobile air flow meter of lead-in wire ".The calibrating installation of automobile air quality flowmeter of the present invention is a kind of at this intelligent flow meter: the voltage signal pin is multiplexed into the flowmeter of data-signal read-write pin, carries out the description of its calibrating installation.
This device also is provided with measuring channel and is provided with the calibration pipeline of valve more than two or two, connects with measuring channel after all calibration pipeline parallel connections.
Normal air mass flow meter SM is installed on the described measuring channel, and computing machine is connected by the output line of data acquisition interface with normal air mass flow meter SM.
Survey sensor interface, reference flowmeter interface are installed on the described measuring channel, and computing machine is connected with the sensor of measuring channel and the output line of reference flowmeter by data acquisition interface.
Heating arrangement and refrigerating plant also are installed on the described measuring channel, and computing machine is connected by the control line of control interface with heating arrangement and refrigerating plant.
This device has the calibration pipeline that is provided with valve more than two or two, connect with measuring channel after all calibration pipeline parallel connections, one end of calibration pipeline is provided with the blower fan of variable-frequence governor control, calibrated flowmeter jack more than 2 or 2 is installed on every calibration pipeline, prioritization scheme as special case, use 8 or 16 calibrated flowmeter jacks, survey sensor is installed on the measuring channel, reference flowmeter interface, computing machine is by control interface and valve, the control line of variable-frequence governor connects, be connected with the sensor of measuring channel and the output line of reference flowmeter by data acquisition interface, be connected with the signal output interface of each calibrated flowmeter by communication interface.
The both sides of described calibration pipeline have valve, and each valve has control line to link to each other with computing machine.When the calibration pipeline was in running order, computer control should be calibrated the valve open of pipeline both sides, and when the flowmeter on the calibration pipeline was replaced or installs, its both sides valve was closed.
Each calibrated flowmeter is provided with the separate equipment reference address.So that each flowmeter can access the calibration function of calibrating at the probe state of this individuality flowmeter.
As a kind of embodiment, described calibration pipeline, measuring channel and blower fan are connected to form the closed circulation pipeline.
A kind of method of utilizing the calibrating installation of automobile air quality flowmeter to the flow meter calibrating, adjust the calibration pipeline and enter normal operating conditions, calibrated flowmeter is installed under the duty on the calibrated flowmeter socket on the calibration pipeline, it is characterized in that: computing machine is according to every calibrated flowmeter corresponding output data groups and target set of data under the calibration point flow, calculate the interpolation calculation function model of every flowmeter, and the parameter of the function model of every flowmeter is transferred to the non-volatile storage space of corresponding flowmeter.
Can finish by the mode of wireless data transmission for the flowmeter that has wireless data transmission function, its device basic is not referring to patent application document " increasing the intelligent automobile air flow meter of lead-in wire " yet.
As a kind of embodiment, described target set of data data use the normal air mass flow meter to obtain by measuring channel.
As another kind of embodiment, described target set of data data obtain by the theoretical output voltage characteristic of flowmeter.
As the third embodiment, the theoretical output voltage characteristic of flowmeter obtains by the reference flowmeter, measure the flow-output voltage characteristic curve of every reference flowmeter, calculate the output voltage characteristic curve of reference flowmeter, and obtain flow-voltage characteristic target data according to the method for average.
Use secondary or the above spline interpolation computing function of secondary to calculate the interpolation calculation function model of each flowmeter.
The calibration operation of all air flowmeter on same pipeline is once finished.The margin of error that causes owing to various factors between the diverse location on different pipelines and the same pipeline all is permanently stored in the calibration software in advance, and carries out corresponding compensation.Each calibrated flowmeter all with the computer realization communication, the various various criterion data that are used for calibrating are input in the software in advance, and calibration software just can be calibrated or the standard output characteristic curve is transplanted in the calibrated flowmeter and realize calibration calibrated flowmeter.
On the flow standard problem, the present invention uses the standard component of standard pitot tube as flow measurement, and its precision is transmitted by the highest metering mechanism (National Meteorological Bureau) of Chinese pitot tube verification.And core of the present invention, with present already present flow calibration device, or flow calibrating installation, or the difference of flow calibration equipment etc. is: the difference that detects tested flowmeter output and desirable flowmeter output by device, and do not changing under the flowmeter hardware condition of (comprising structure, encapsulation and component parameter), change the voltage output characteristic curve of flowmeter by the software algorithm that changes calibrated flowmeter, make it consistent with the voltage output characteristic curve of desirable flowmeter.Computing machine in the device is by measuring the flow/output voltage primitive character curve that obtains the calibrated flowmeter thermal probe, and according to desirable flow/voltage output characteristic curve, formation is converted into primary curve the algorithm of ideal curve, computing machine is delivered to this algorithm in the non-volatile storage space of calibrated flowmeter, thereby allows the desirable flow/output voltage characteristic relation of calibrated flowmeter output.Theoretically, use the precision of the precision of the automobile air flow meter that the present invention produced near caliberating device.Device of the present invention is based on large-scale production and application, design has the two or many calibration pipeline sections that can take turns to change jobs, design has a plurality of calibrated flowmeter interfaces on the every calibration pipeline section, has therefore produced a kind of present brand-new flow motor family planning product method that is different from fully.
The present invention can calibrate 8 or more automobile air flow meters simultaneously; Calibration to automobile air flow meter can be carried out the calibration of voltage output characteristics according to the normal air mass rate, also can carry out the reference calibration according to the output voltage characteristic of reference flowmeter.The present invention is not changing under the flowmeter hardware condition of (comprising component parameter), can change the voltage output characteristic curve of calibrated flowmeter, makes it consistent with the voltage output characteristic curve of desirable flowmeter.Control computer in the device is by measuring the flow/output voltage primitive character curve of calibrated flowmeter thermal probe, and according to desirable flow/voltage output characteristic curve, generation is converted into primary curve the algorithm of ideal curve, and this algorithm being delivered in the non-volatile storage space of calibrated flowmeter, thereby the flow/output voltage characteristic relation that allows calibrated flowmeter realize ideal.Device of the present invention is based on large-scale production and application, so the present invention changed the production method of traditional automobile air flow meter, has produced a kind of traditional new production process that is different from fully.Make each flowmeter of producing have very high degree of accuracy, and adapt to sensor measurement difference separately automatically, promptly do not influence the degree of accuracy of output signal because of the difference of sensor probe; The design and the production of having unified the different model flowmeter significantly reduce the production and the inventory cost of flowmeter.
Description of drawings
Fig. 1 is the output voltage characteristic synoptic diagram of flowmeter thermal probe and flowmeter,
Fig. 2 is that the present invention demarcates the calibration system hardware schematic representation of apparatus.
Among the figure: 1-thermal probe output voltage characteristic curve, 2-flowmeter output voltage characteristic curve, 3-computing machine, the 4-control interface, 5-calibration pipeline A, 6-communication interface, 7-calibration pipeline B, 8-data acquisition interface, 9-calibration pipeline A valve, 10-calibrated flowmeter jack, 11-calibration pipeline B valve, 12-measuring channel, 13-reference flowmeter interface, 14-normal air mass flow meter SM, 15-heating arrangement, the 16-refrigerating plant, 17-blower fan, 18-variable-frequence governor.
Embodiment
The present invention is further described below in conjunction with drawings and Examples: as shown in Figure 2, the calibrating installation of described automobile air quality flowmeter, this device is by computing machine 3 controls, be provided with calibration pipeline 5,7, calibration pipeline 5,7 are provided with calibrated flowmeter jack 10, corresponding calibrated flowmeter is installed on the calibrated flowmeter jack 10, this device is provided with communication interface 6, communication interface 6 is connected with calibrated flowmeter, the voltage output pin of calibrated flowmeter is configured to the multiplexing pins of voltage output and data communication, and computing machine reads the data of the output voltage and the read-write flowmeter of flowmeter via this root pin by communication interface 6 and lead-in wire.
This device also is provided with measuring channel 12 and is provided with the calibration pipeline 5,7 of valve 9,11 more than two or two, connects with measuring channel 12 in all calibration pipeline 5,7 backs in parallel.
Normal air mass flow meter SM14 is installed on the described measuring channel 12, and computing machine is connected by the output line of data acquisition interface with normal air mass flow meter SM14.
Survey sensor interface, reference flowmeter interface 13 are installed on the described measuring channel 12, and computing machine 3 is connected with the sensor of measuring channel 12 and the output line of reference flowmeter by data acquisition interface.
A kind of method of utilizing the calibrating installation of automobile air quality flowmeter to the flow meter calibrating, adjust the calibration pipeline and enter normal operating conditions, install on the calibrated flowmeter socket of calibrated flowmeter to the calibration pipeline of duty, computing machine is according to every calibrated flowmeter corresponding output data groups and target set of data under the calibration point flow, calculate the interpolation calculation function model of every flowmeter, and the parameter of the function model of every flowmeter is transferred to the non-volatile storage space of corresponding flowmeter.
Also can finish for the flowmeter that has wireless data transmission function, referring to patent application document " not increasing the intelligent automobile air flow meter of lead-in wire " by the mode of wireless data transmission.
The voltage signal pin multiplexing of intelligent automobile air flow meter that can be by not increasing lead-in wire in the parameter transmission of the function model of this every flowmeter becomes data communication read-write pin to finish, also can finish for the flowmeter that has wireless data transmission function by the mode of wireless data transmission, is example at this with data communication read-write pin that the voltage signal pin multiplexing by the automobile air quality flowmeter becomes, and illustrate that on production line the special purpose vehicle air flow meter that hardware can be made the finished product that finish by this device produces the main process of method of the automobile air quality flowmeter of high precision fast by the suitable function of importing this flowmeter probe correspondence.Can be through such process with fine difference and the inconsistency of bringing owing to the error of machining, measure accurately and use a computer when the device debugging by software and compensate, can carry out recalibration.
Described target set of data data obtain by one of following three kinds of modes:
1, obtains by measuring channel: use normal air mass flow meter sampling pitot tube mode to obtain, and calculate the gas mass flow under the standard state.
2, the theoretical output voltage characteristic by flowmeter obtains.
3, obtain by the reference flowmeter, measure the flow-output voltage characteristic curve of every reference flowmeter, calculate the output voltage characteristic curve of reference flowmeter, and obtain flow-voltage characteristic target data according to the method for average.
Use secondary or the above spline interpolation computing function of secondary to calculate the interpolation calculation function model of each flowmeter.
As shown in Figure 2, as a kind of exemplary embodiments, the calibration system hardware device that the present invention relates to comprises two (can more than two) calibration pipeline A5 and calibration pipeline B7, and the two ends of every calibration pipeline are equipped with electrically operated valve 9,11, to switch the calibration pipeline, two calibration pipelines are connected in parallel.When the in running order execution calibration process of A pipeline section, the valve closing of B pipe ends, the calibrated flowmeter that operating personnel can change on the B pipeline, vice versa, to improve the efficient of calibrating installation.Described each calibration pipeline is provided with n calibrated flowmeter interface, and calibration pipeline A goes up design has A1, A2, A3 ... a plurality of calibrating flow meter interfaces such as An, calibration pipeline B goes up design has B1, B2, B3 ... a plurality of calibrating flow meter interfaces such as Bn.Device comprises a measuring channel, measures installation code gas mass flow measuring device SM, reference flowmeter SF, well heater and refrigerator on the pipeline section, measures pipeline section and connects with the calibration pipeline section.Use blower fan as gas generator, use variable-frequence governor to regulate the rotating speed of blower fan, big or small continuously adjustable flow takes place, air flow path design becomes flexible way, can enter by atmosphere by measuring pipeline section, also can constitute recycle design, as the dotted portion among Fig. 2, the outlet of blower fan connects measures pipeline section, changes at needs under the situation of temperature, and recycle design can obviously cut down the consumption of energy.According to the production lot requirement, can increase the quantity of calibration pipeline, also can increase the quantity of the calibrated flowmeter interface that is provided with on the calibration pipeline, to improve the efficient of calibrating installation.Computing machine is controlled electrically operated valve by control interface, as the VA1 among the figure, and VA2, the switch of VB1 and VB2 is to select the calibration pipeline of work.The flow of computer control rotation speed of fan need arbitrarily to obtain; The temperature that computing machine is regulated moving air in the pipeline by the power output that starts refrigeration or control heater; Pipeline gas temperature among the computer acquisition SM, pipeline gas humidity, atmospheric pressure, pipeline gas gauge pressure and pitot tube differential pressure are to accurately calculate the MAF under the standard state in the pipeline.Computing machine detects the output voltage of reference flowmeter to obtain the output voltage characteristic curve of reference flowmeter by data acquisition; Computing machine reads thermal probe voltage in each flowmeter by communication interface, to obtain the output voltage characteristic curve and the temperature drift characteristic of each calibrated flowmeter thermal probe, and by calculate producing corresponding computing function and algorithm, and this function and algorithm be transferred to nonvolatile memory in the corresponding calibrated flowmeter.Computing machine reads the output voltage of calibrated flowmeter to check the actual result after calibrated flowmeter is calibrated by data acquisition.
The calibration flow process that the embodiment of the invention relates to comprises two modes, i.e. standard calibration mode and reference calibrating mode.Dual mode all is with the flowmeter output voltage characteristic curve 2 of the thermal probe output voltage characteristic curve shown in Fig. 11 through the calibration outputting standard, but the calibration of dual mode is with reference to difference.
1. standard calibration mode
Described standard calibration mode is meant that with the measured flowrate measurement value of calibrating gas mass flow meter SM serve as according to the calibrating mode that carries out.
Under the condition of known mass flow meter voltage output characteristic curve, can use the standard calibration mode to calibrate automobile air flow meter, flowmeter voltage output characteristic curve, can obtain according to the discrete point of different flow down-off meter theory of correspondences output voltage, also can be the calculation expression that concrete output voltage (Volt) changes with flow (kf/h).
Set 9-11 traffic alignment point, comprise zero flow and maximum flow, selecting the A pipeline is service pipe, and calibrated flowmeter is inserted calibrated flowmeter interface A1 respectively, A2, and A3 is on the An; The computer control rotation speed of fan is from zero flow, progressively run to each calibration point flow, the output voltage of each calibrated fluxes down-off meter thermal probe of computer recording, calculate the theoretical output voltage of this flow down-off meter simultaneously, form a series of corresponding data groups thus, according to these a series of corresponding data groups, calculate the quadratic spline interpolation calculation function model of every calibrated flowmeter, again the parameter of this model is transferred to the non-volatile storage space of corresponding flowmeter, after finishing calibration, flowmeter is gathered the thermal probe voltage data, calculate output voltage according to the given computing method of non-volatile storage space again, by the D/A conversion calculated value is become the output of virtual voltage output valve, the flowmeter that is calibrated has the precision approaching with calibrating installation in theory.
Above-mentioned calibration process computing machine is finished automatically, and during this period, operating personnel carry out the installation and removal work of calibrated flowmeter on the inoperative pipeline, and the periodic duty of two calibration pipeline sections is to improve the efficient of device.
If flowmeter need carry out temperature compensation, use the same method, the gas flow temperature of control calibrating installation can compensate calibration to temperature.
2. reference calibrating mode
Described reference calibration is meant that calibration is preceding and do not know flowmeter desired output voltage characteristic curve, but has the automobile air flow meter sample of some, need calibrate production according to the output characteristic curve of sample flow meter.
The reference calibration can use two kinds of methods to finish:
1) goes out the output voltage characteristic curve of reference flowmeter by this measurement device.This method is preferably selected many reference flowmeters for use, measures the flow-output voltage characteristic curve of every reference flowmeter, according to the output voltage characteristic curve of method of average calculating reference flowmeter, to avoid the error risk of single reference flowmeter.
Calibrate according to the standard calibration mode afterwards.
2) directly calibrate according to the output voltage characteristic curve of reference flowmeter.
Set 9-11 traffic alignment point, comprise zero flow and maximum flow, selecting the A pipeline is service pipe, and calibrated flowmeter is inserted calibrated flowmeter interface A1 respectively, A2, and A3 is on the An; The computer control rotation speed of fan is from zero flow, progressively run to each calibration point flow, the output voltage of each calibrated fluxes down-off meter thermal probe of computer recording, measure the output voltage of reference flowmeter simultaneously, form a series of corresponding data groups thus, according to these a series of corresponding data groups, calculate the quadratic spline interpolation calculation function model of every calibrated flowmeter, again the parameter of this model is transferred to the non-volatile storage space of corresponding flowmeter, after finishing calibration, flowmeter is gathered the thermal probe voltage data, calculate output voltage according to the given computing method of non-volatile storage space again, by the D/A conversion calculated value is become the output of virtual voltage output valve, the flowmeter that is calibrated has the precision approaching with calibrating installation in theory.
Claims (10)
1. the calibrating installation of an automobile air quality flowmeter, this device is by computer control, be provided with the calibration pipeline, the calibration pipeline is provided with the calibrated flowmeter jack, corresponding calibrated flowmeter is installed on the calibrated flowmeter jack, this device is provided with communication interface, communication interface is connected with calibrated flowmeter, it is characterized in that: the voltage output pin of calibrated flowmeter is configured to the multiplexing pins of voltage output and data communication, and computing machine reads the data of the output voltage and the read-write flowmeter of flowmeter via this root pin by communication interface and lead-in wire.
2. the calibrating installation of automobile air quality flowmeter according to claim 1, it is characterized in that: this device also is provided with measuring channel (12), with the calibration pipeline that is provided with valve (9,11) more than two or two (5,7), connect with measuring channel (12) in all calibration pipelines (5,7) back in parallel.
3. the calibrating installation of automobile air quality flowmeter according to claim 2, it is characterized in that: normal air mass flow meter SM (14) is installed on the described measuring channel (12), and computing machine is connected by the output line of data acquisition interface with normal air mass flow meter SM (14).
4. the calibrating installation of automobile air quality flowmeter according to claim 3, it is characterized in that: survey sensor interface, reference flowmeter interface (13) are installed on the described measuring channel (12), and computing machine (3) is connected with the sensor of measuring channel (12) and the output line of reference flowmeter by data acquisition interface.
5. according to the calibrating installation of claim 2 or 3 or 4 described automobile air quality flowmeters, it is characterized in that: heating arrangement (15) and refrigerating plant (16) are installed on the described measuring channel (12), and computing machine (3) is connected with the control line of heating arrangement (15) with refrigerating plant (16) by control interface.
6. method of utilizing the calibrating installation of automobile air quality flowmeter to the flow meter calibrating, adjust the calibration pipeline and enter normal operating conditions, install on the calibrated flowmeter socket of calibrated flowmeter to the calibration pipeline of duty, it is characterized in that: computing machine is according to every calibrated flowmeter corresponding output data groups and target set of data under the calibration point flow, calculate the interpolation calculation function model of every flowmeter, and the parameter of the function model of every flowmeter is transferred to the non-volatile storage space of corresponding flowmeter.
7. the calibration steps of automobile air quality flowmeter according to claim 6 is characterized in that: described target set of data data use the normal air mass flow meter to obtain by measuring channel.
8. the calibration steps of automobile air quality flowmeter according to claim 6 is characterized in that: described target set of data data obtain by the theoretical output voltage characteristic of flowmeter.
9. the calibration steps of automobile air quality flowmeter according to claim 6, it is characterized in that: the theoretical output voltage characteristic of flowmeter obtains by the reference flowmeter, measure the flow-output voltage characteristic curve of every reference flowmeter, calculate the output voltage characteristic curve of reference flowmeter according to the method for average, and obtain flow-voltage characteristic target data.
10. the calibration steps of automobile air quality flowmeter according to claim 6 is characterized in that: use secondary or the above spline interpolation computing function of secondary to calculate the interpolation calculation function model of each flowmeter.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979968A (en) * | 2010-10-14 | 2011-02-23 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN102944292A (en) * | 2012-11-28 | 2013-02-27 | 柳青 | Car air quality flow meter calibration device and calibration method |
| CN102967350A (en) * | 2012-11-28 | 2013-03-13 | 柳青 | Calibration device and calibration method for automobile air mass flow meter |
| CN104422500A (en) * | 2013-09-03 | 2015-03-18 | 北京谊安医疗系统股份有限公司 | Flow calibrating method and flow calibrating system for flow sensors of anaesthesia machines |
| CN105890718A (en) * | 2014-12-03 | 2016-08-24 | 杭州派乐科技有限公司 | Portable multi-channel flow totalizer field calibrator and control circuit thereof |
| CN106679770A (en) * | 2016-11-22 | 2017-05-17 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flow meter |
| CN111344542A (en) * | 2019-06-28 | 2020-06-26 | 深圳市大疆创新科技有限公司 | Flowmeter calibration system, method, device and storage medium |
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
| CN112964336A (en) * | 2020-11-06 | 2021-06-15 | 联合汽车电子有限公司 | Air flow calibration equipment and calibration method thereof |
| CN117267111A (en) * | 2023-11-02 | 2023-12-22 | 河南同助祥机械有限公司 | Movable compressor gas consumption measuring device |
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2009
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979968B (en) * | 2010-10-14 | 2013-02-13 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN101979968A (en) * | 2010-10-14 | 2011-02-23 | 同济大学 | Device and method for testing air quality sensor and air flow sensor |
| CN102944292A (en) * | 2012-11-28 | 2013-02-27 | 柳青 | Car air quality flow meter calibration device and calibration method |
| CN102967350A (en) * | 2012-11-28 | 2013-03-13 | 柳青 | Calibration device and calibration method for automobile air mass flow meter |
| CN104422500A (en) * | 2013-09-03 | 2015-03-18 | 北京谊安医疗系统股份有限公司 | Flow calibrating method and flow calibrating system for flow sensors of anaesthesia machines |
| CN105890718B (en) * | 2014-12-03 | 2023-01-13 | 杭州派乐科技有限公司 | Portable multi-channel flow integrating instrument field calibrator and control circuit thereof |
| CN105890718A (en) * | 2014-12-03 | 2016-08-24 | 杭州派乐科技有限公司 | Portable multi-channel flow totalizer field calibrator and control circuit thereof |
| CN106679770A (en) * | 2016-11-22 | 2017-05-17 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flow meter |
| CN106679770B (en) * | 2016-11-22 | 2024-02-27 | 重庆川仪自动化股份有限公司 | Mass calibration system and method for mass flowmeter |
| CN111344542A (en) * | 2019-06-28 | 2020-06-26 | 深圳市大疆创新科技有限公司 | Flowmeter calibration system, method, device and storage medium |
| CN112964336A (en) * | 2020-11-06 | 2021-06-15 | 联合汽车电子有限公司 | Air flow calibration equipment and calibration method thereof |
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
| CN117267111A (en) * | 2023-11-02 | 2023-12-22 | 河南同助祥机械有限公司 | Movable compressor gas consumption measuring device |
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